Aeroplane with supporting surface subdivided by gaps



July 15, 1930. J. KSQLL 1,770,575

AEROPLANE WITH SUPPORTING SURFACE SUBDIVIDED BY GAPS Filed Feb. 4, 1929atented July 15, 1930 1,770,575

STATES PATENT OFFIE JOSEPH KSOLL, F. BRESLAU, GERMANY AEROPLANE WITHSUPPORTING SURFACE SUBDIVIDED ZBY GAPS Application filed February 4,1929, Serial No. 337,422, and in Germany December 3, 1927.

This invention relates to an aeroplane with the rear, both gapsconverging above the supporting surfaces subdivided by gaps. In head ofthe rear flap to a further narrowing aircraft of this type the raisingforce (ca) is common outlet gap. small and the resistance (0w) of thesupport- In testimony whereof I affix my signature.

ing surface is great, when the gaps are pro- JOSEPH KSOLL.

duced with small adjusting angles. Experiments have shown that theraising force and resistance are more similar to those of a normalsupporting surface, when some of the gaps start, in a manner known perse,

from the rear portion and the others from the front portion of the lowerside of the supporting surface and these gaps endall at the rear in acommon gap.

i In order to reduce the possibility of the formation of air eddiesabove the supporting surface it is advisable, to make the common gap inwhich all the other gaps join extend only to above the front portion ofthe rearmost portion of the supporting surface, the so-called flap. 7

By tapering towards the open rear end the common gap into which theother gaps merge the raising force is still further increased.

An embodiment of the invention is illustrated, by way of example, in theaccompanying drawing in which the only figure shows diagrammatically aform of construction of the supporting elements for an aeroplaneaccording to the invention.

a, b, c designate the several portions of the supporting surfaceseparated from each other by gaps d, e. The portion c,the so-calledflap, is adapted to be oscillated around an axle f into the positionindicated in dash lines.

The two gaps d, e end each in a common gap g which extends only to abovethe front portion of flap 0 in rearward direction and tapers from thepoint h, at which the gaps d, 6 merge 90 1nt0 1t, towards the rear andopen end a.

In supporting faces for aeroplanes the combination with a narrowingnozzle-like gap in 5 the airfoil, rising from the front part of the 95under side of the airfoil to the upper side of said airfoil at anincline towards the rear, of a narrowing nozzle-like gap between therearward end of the airfoil and the forward end of the rear flap, whichgap rises to the upper side of said flap at an incline towards

